Four stars: I liked it. If I have a copy of this book, I'll keep it. If I don't own this book, I might consider buying it (probably used).
This was an easy and fast read for me. The concepts were familiar (I've read several books like this on sport psychology and coaching), and they align rather well with the ideas that I already know and use in my own life (I am a sport coach). In short: success is the result of dedicated practice and development of skills combined with a process-oriented approach to using those practiced skills in competition. Done right, the lessons of sport and the lessons in life mirror each other, and augment each other.
I'm reading this book about 10 years after publication, so some of the references seem dated. Women are largely invisible in this book. This is not mean-spirited or intentional, it's just a function of the author's own life experiences in sport psychology and golf instruction... it's what he knows. While I think that most of the concepts are universal (I am male, so perhaps slightly blind, myself), some things, such as developing a confident self-image, may be more complex for those who are not cis-gender males trying to make it in a male-dominated area, such as sport or business.
There is one section in which he shares something that he discusses with some of his clients, who tend to be largely young men pursuing professional golf careers: advice on how to think about selecting a spouse. This section I found obtuse, as it focused on the spouse as the supporter of the athlete, who is the one who is trying to be exceptional. What if the athlete becomes involved with someone who, herself, is trying to be exceptional in her field?
I think that it could have been trimmed by about 50 pages without losing much. The conversational tone was nice, but some of the vignettes and stories seemed to meander a bit. I think that the book is strongest in the beginning and middle, a little weaker near the end. The whole book feels like it's one draft shy of being really done, or a bit rushed near the end.